Triangle Classification Worksheet
A Grade 8 math worksheet focusing on classifying triangles by their sides and angles, including various problem types.
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Triangle Classification Worksheet
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Read each question carefully and classify the triangles based on their side lengths and angle measures. Show all your work when necessary.
1. A triangle with all three sides of different lengths is called:
Equilateral
Isosceles
Scalene
Right
2. What type of triangle has one angle greater than 90 degrees?
Acute
Obtuse
Right
Equiangular
3. An equilateral triangle has three sides and three angles.
4. A right-angled triangle must have exactly one angle that measures degrees.
5. An isosceles triangle has at least two sides.
6. Classify the triangle shown below by its sides and angles. Explain your reasoning.
7. A triangle has angle measures of 30°, 60°, and 90°. Classify this triangle by its angles and sides.
8. An acute triangle can also be an isosceles triangle.
True
False
9. All equilateral triangles are also acute triangles.
True
False
Match the triangle description with its classification.
10. All angles are less than 90°
a. Obtuse
11. One angle is 90°
b. Acute
12. One angle is greater than 90°
c. Right
13. All sides are equal
d. Scalene
14. No sides are equal
e. Isosceles
15. Two sides are equal
f. Equilateral